I don't use uber, or any other taxi app. Depends a lot on where you live and whether public taxis and public transport infrastructure is well developed. I can imagine this would be a nightmare in the USA, it was when I lived there pre-Uber days, waiting for a bus could take 45 mins. Out here in Asia, Tokyo, Singapore, Hong Kong etc, there really isn't a big need for Uber, sure it's useful, but plenty of alternatives that are just as convenient.